Meant to type epidermis but any micro-abrasion will provide a path.
However, health care workers in the USA and Africa seem to have an unusually high percentage of wounded skin that, apparently, they don't know they have.
Then, they seem to have unusually bad luck, since the virus keeps finding the wounded skin they don't know they have.
Bottom Line - we have dozens, perhaps hundreds, of infections in people who were working in hazmat suits.
But we have no clear explanation for how they became infected, except that they “broke protocol.”
Not very helpful.
And not very calming.